fix: handle empty strings after event removal in transcription processing (...

TnR2

2025-10-01 528f92f7a2a26cade1c57ccf26b0ba6524e7cae5

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¼    1/4
½    1/2
¾    3/4
⅐    1/7
⅑    1/9
⅒    1/10
⅓    1/3
⅔    2/3
⅕    1/5
⅖    2/5
⅗    3/5
⅘    4/5
⅙    1/6
⅚    5/6
⅛    1/8
⅜    3/8
⅝    5/8
⅞    7/8